JPH11199639A - Soft resin composition and molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soft resin composition having a small variation of tensile properties with passing of time and having excellent water resistance, processability and impact resistance, and a molded product using the composition. SOLUTION: This soft resin composition contains (A) an epoxy acrylate, (B) a urethane acrylate and (C) a copolymerizable monomer. A weight ratio of the epoxy acrylate as the component A to the urethane acrylate as the component B is: (40/60)<(epoxy acrylate A/urethane acrylate B)<=(10/90). Furthermore, the soft resin composition is hardened with heat or light to obtain the objective molded product.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft resin composition and a molded product using the resin composition, and more particularly to a structure such as a concrete or mortar structure or a structure using a metal precursor. The present invention relates to a soft resin composition having excellent waterproofness, crack followability and blister resistance, and a sheet-like or panel-like molded product using the resin composition.

[0002]

2. Description of the Related Art Conventionally, a soft unsaturated polyester resin (a resin obtained by dissolving an unsaturated polybasic acid or an alkyd resin obtained by a dehydration condensation reaction of a saturated polybasic acid with glycol in styrene) has a high elongation of the cured resin. Water-resistant to concrete while impregnating the fiber-reinforced material with such a soft unsaturated polyester resin because of its high rate and excellent conformability to concrete, etc., and easy adjustment of liquid resin viscosity and gel time. It is used in the method of providing layers. In particular, the resin is effective as a waterproof material for roofs, verandas, parking lots, and the like of concrete or reinforced concrete buildings.

However, the conventional soft unsaturated polyester resin has a low crosslink density, so that moisture easily penetrates into the cured product, and water accumulates between the resin layer and the primer or between the resin layers to form blisters. Have a point.

[0004] Further, these conventional soft unsaturated polyester resins have low elasticity and high elongation at the time of molding, but lose their properties over time and become hard, and cracks occur in the lining layer several years after construction. Often. Such cracks not only impair the appearance, but also cause water leakage and the like, and cannot function as a waterproof material.

In order to improve such water resistance, an epoxy acrylate resin excellent in chemical resistance and a soft resin in which a rubber compound is introduced for the purpose of imparting flexibility thereto have been proposed. Although it is high and has excellent chemical resistance, it has the drawbacks that elongation decreases over time like a soft unsaturated polyester resin, workability is poor due to high resin viscosity, and resin raw materials are expensive. doing.

In recent years, it has been used not only as a waterproofing material but also for lining floors of factories and the like with such a resin. In this case, the conventional soft unsaturated polyester resin or epoxy acrylate resin cannot sufficiently absorb the stress when a heavy object falls, and in some cases, the lining layer is broken by the impact, and the chemical resistance and Good impact properties are required.

[0007] JP-A-4-41926 and Japanese Patent Publication No.
JP-A-39492 proposes a construction method in which a sheet formed in advance using a soft unsaturated polyester resin and a fiber reinforcing material is directly attached to a floor or the like. While this method has the advantage that it can be installed in a short period of time, it is necessary to cut the sheet with a cutter or scissors when sticking the sheet on site, so a flexible resin with good workability is required. Is done. However, conventional soft unsaturated polyester resins and epoxy acrylate resins have poor cutting properties, and have the problem that cracks are formed in the processed cross section.

[0008]

SUMMARY OF THE INVENTION Accordingly, claims 1 to 7 are provided.
The object of the invention described is good adhesion with the fiber reinforcement,
It is an object of the present invention to provide a soft resin composition having excellent balance between water resistance and elongation, workability, impact resistance and chemical resistance.

An object of the invention described in claim 8 is to achieve a balance between water resistance and elongation by using the soft resin composition of the present invention.
An object of the present invention is to provide a molded article excellent in processability, impact resistance and chemical resistance, particularly a sheet-shaped or panel-shaped molded article.

[0010]

Means for Solving the Problems As a result of investigations to solve the above problems, the present inventors have found that a soft urethane acrylate resin is mixed and mixed in a specific ratio with an epoxy acrylate resin to obtain a soft resin composition of the present invention. The product and the molded product were completed.

[0011] The soft resin composition according to claim 1 comprises (A)
A resin composition comprising epoxy acrylate, (B) urethane acrylate and (C) a copolymerizable monomer, wherein the weight ratio of (A) epoxy acrylate to (B) urethane acrylate is 40/60 <. (A) epoxy acrylate / (B) urethane acrylate ≦ 10/90
It is characterized by being.

The soft resin composition according to claim 2 is the soft resin composition according to claim 1, wherein (A) the epoxy acrylate is a bisphenol type epoxy resin and (meth)
It is a reaction product with acrylic acid.

According to a third aspect of the present invention, there is provided the soft resin composition according to the first or second aspect, wherein the urethane acrylate (B) comprises one or more hydroxyl groups and one or more hydroxyl groups in one molecule.
A reaction product of a compound having two or more copolymerizable unsaturated groups, a glycol and / or a polyol having two or more hydroxyl groups in one molecule, and a compound having two or more isocyanate groups in one molecule. There is a feature.

The soft resin composition according to the fourth aspect is the soft resin composition according to the third aspect, wherein the glycol and / or the polyol having two or more hydroxyl groups in one molecule are:
It is a polyethylene glycol and / or a polypropylene glycol obtained from ethylene oxide and / or propylene oxide, respectively.

The soft resin composition according to the fifth aspect is characterized in that the soft resin composition according to any one of the first to fourth aspects further comprises a reinforcing material.

According to a sixth aspect of the present invention, there is provided the soft resin composition according to the fifth aspect, wherein the reinforcing material is a nonwoven fabric of organic fibers.

According to a seventh aspect of the present invention, there is provided the soft resin composition according to the fifth aspect, wherein the reinforcing material is glass fiber and / or carbon fiber.

The molded article according to the eighth aspect is characterized by being obtained by curing the soft resin composition according to any one of the first to seventh aspects with heat or light.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The soft resin composition of the present invention comprises:
(A) epoxy acrylate, (B) urethane acrylate and (C) a copolymerizable monomer.
In the present specification, for example, (meth) acrylic acid means acrylic acid and methacrylic acid.

The epoxy acrylate (A) used in the present invention can be obtained by a known method from the reaction between a bisphenol type epoxy resin and (meth) acrylic acid. Such epoxy acrylates preferably have a molecular weight of 500 to 4000 from the viewpoint of solubility. Such an epoxy acrylate can be used alone or by dissolving it in advance in a copolymerizable monomer when the resin composition of the present invention is blended.

The bisphenol type epoxy resin is not particularly limited, but for example, an epoxy equivalent of 174 to 200
Bisphenol A and / or F type epoxy resin of 0 are preferably used in view of chemical resistance and mechanical properties.

The urethane acrylate (B) used in the present invention comprises a compound having at least one hydroxyl group and at least one copolymerizable unsaturated group in one molecule and a compound having at least two hydroxyl groups in one molecule. From a glycol and / or polyol having a hydroxyl group and a compound having two or more isocyanate groups in one molecule, a known method, for example,
No. 30527, JP-B-55-8013, JP-B-54-21879, JP-B-60-26132 or JP-B-60-26133, and urethane is contained in the polymer chain. A polymer having a bond and having an acryloyl group or a methacryloyl group at the polymer terminal.

Examples of the compound having one or more hydroxyl groups and one or more copolymerizable unsaturated groups in one molecule include hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 2-hydroxybutyl. (Meta)
Acrylate, phenoxyhydroxypropyl (meth)
Acrylate, trimethylolpropane di (meth) acrylate, dipropylene glycol mono (meth) acrylate, and the like can be used.

The glycols and / or polyols having two or more hydroxyl groups in one molecule include, for example,
Neopentyl glycol, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, trimethylene glycol, hydrogenated bisphenol A, bisphenol A ethylene oxide adduct,
Saturation having a molecular weight of 1,000 to 2,000 obtained by a dehydration condensation reaction of a glycol such as bisphenol A propylene oxide adduct and a polybasic acid such as adipic acid, (phthalic anhydride), isophthalic acid, terephthalic acid, and trimellitic acid. Polyester glycol or polyethylene glycol having a molecular weight of 300 to 2,000 obtained by a ring-opening reaction of ethylene oxide or propylene oxide, polypropylene glycols or polycaprolactone obtained by a ring-opening reaction of caprolactone, alone or in combination of two or more kinds Can be used. When the molecular weight of these polyol components is within the above range, the viscosity of the obtained resin composition is good, and the workability of the step of impregnating the liquid resin composition with the reinforcing material is excellent, which is preferable.

As the compound having two or more isocyanate groups in one molecule, an aromatic and / or aliphatic polyisocyanate compound is used. For example, tolylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, hexamethylene Examples thereof include diisocyanate, isophorone diisocyanate, xylylene diisocyanate, and hydrogenated xylylene diisocyanate, and these can be used alone or as a mixture of two or more.

The (C) copolymerizable monomer used in the present invention includes, for example, mono (meth) acrylates such as styrene, vinylstyrene or alkyl (meth) acrylate, ethylene glycol di (meth) acrylate, and poly (meth) acrylate. There are di (meth) acrylates such as alkylene glycol di (meth) acrylate, and polyfunctional (meth) acrylates such as trimethylolpropane tri (meth) acrylate and pentaerythritol tetra (meth) acrylate. These may be used alone or in combination. These can be used in combination.

Such a copolymerizable monomer can be used in an amount of 10 to 100 parts by weight based on 100 parts by weight of the blend of (A) epoxy acrylate and (B) urethane acrylate. If the amount is less than 10 parts by weight, the viscosity becomes high, and the workability such as mixing of the curing catalyst and the filler becomes poor,
If the amount exceeds 100 parts by weight, the properties of the copolymerizable monomer become too strong, and the flexibility, chemical resistance, toughness, and adhesion to the fiber reinforcing material of the obtained resin composition are impaired.

In the present invention, the weight ratio of (A) epoxy acrylate to (B) urethane acrylate must be in the range of (A) epoxy acrylate: (B) urethane acrylate = 60: 40 to 10:90. Must. (A) The use ratio of epoxy acrylate is
If it is less than 40, the curability is poor, and the adhesion to fibers and water resistance tend to decrease. If it is more than 60, the impact resistance tends to decrease and the cutting properties tend to deteriorate.

In the present invention, the resin composition may further contain a reinforcing material. As such a reinforcing material, a nonwoven fabric of glass fiber, carbon fiber, organic fiber, or the like can be used. A blend resin of (A) epoxy acrylate, (B) urethane acrylate, and (C) a copolymerizable monomer is used. It can be used by impregnating such a reinforcing material.

The glass fiber or carbon fiber may be in the form of a roving cloth, chopped strand mat, surface mat or the like usually used in FRP molding, and the non-woven fabric of the organic fiber may be polyester fiber, acrylic fiber,
Nonwoven fabrics such as carbon fibers can be used, and these can be used alone or in combination of two or more.

The reinforcing material is based on 100 parts by weight of a blend resin obtained by mixing (A) epoxy acrylate, (B) urethane acrylate and (C) a copolymerizable monomer.
It can be used in the range of 1 to 60 parts by weight, preferably 1 to 55 parts by weight. If the amount is less than 1 part by weight, the cured product has insufficient mechanical properties and cannot exhibit sufficient strength against a load. If the amount exceeds 60 parts by weight, the molding workability deteriorates and is not practical. Further, within the range of 1 to 55 parts by weight, more effective effects can be obtained.

In the soft resin composition of the present invention, an organic peroxide or an ultraviolet initiator is dissolved in the resin composition, the organic peroxide is cured at room temperature or by heating, and the ultraviolet initiator is cured by irradiating ultraviolet rays. be able to.

Examples of such organic peroxides include methyl ethyl ketone peroxide, cumene hydroperoxide, benzoyl peroxide, t-butyl peroxide, t-butyl peroxybenzoate and the like.

As the ultraviolet initiator, for example, benzoin alkyl ethers such as benzoin methyl ether and benzoin butyl ether, 2,2-dimethoxy-2-phenylacetophenone, 2-hydroxy-2-
Methyl-1-phenylpropan-1-one, 1-hydroxycyclohexylphenylketone, 2-methyl-1-
[4- (methylthio) phenyl] -2-morpholino-
Examples include acetophenones such as propan-1-one and ketals such as acetophenone dimethyl ketal and benzyl dimethyl ketal.

These organic peroxides or ultraviolet initiators are used in an amount of 0.01 to 100 parts by weight of a blend resin obtained by mixing (A) epoxy acrylate, (B) urethane acrylate and (C) a copolymerizable monomer. It can be used in the range of 10 to 10 parts by weight, preferably 0.1 to 5 parts by weight. If the amount is less than 0.1 part by weight, the curing is slow and impractical. If the amount exceeds 5 parts by weight, the molecular weight is hardly increased because the number of radical sources increases, and the heat resistance and water resistance of the obtained cured product are impaired. Not so appropriate. At this time, if necessary, an organic metal salt such as cobalt or iron, a tertiary amine or the like can be blended as a catalyst in order to promote the decomposition of the organic peroxide.

Further, in order to secure an appropriate gel time at the construction site, a known amine-based co-promoter or a known polymerization inhibitor is used as needed within a proper range used by those skilled in the art. be able to.

If necessary, a paraffin wax can be added to the resin composition in order to harden the surface in contact with air and finish the surface without tack. The amount of addition is 0.001 to 0.5 with respect to 100 parts by weight of the resin.
If the amount is less than 0.001 part by weight, the paraffin wax is insufficient and the tack remains, and if the amount is more than 0.5 part by weight, the wax separates from the resin composition, resulting in poor handling.

In the present invention, in addition to the above components, pigments, solvents, fillers, adhesives and the like can be added and used as needed within a proper range used by those skilled in the art.

The soft resin composition of the present invention includes, for example,
(A) Epoxy acrylate and (B) urethane acrylate are mixed at a predetermined ratio, and this is uniformly dissolved in (C) a copolymerizable monomer, or (A) epoxy acrylate and (B) urethane acrylate are mixed. The components (C), each of which is uniformly dissolved in the copolymerizable monomer, are mixed at a predetermined ratio, and then the obtained mixture is mixed with an organic peroxide, an ultraviolet initiator, an organic metal salt, and an amine-based compound. It can be obtained by adding a co-promoter, a polymerization inhibitor, a wax, a pigment, a solvent, a filler, an adhesive, and the like, and stirring and mixing at room temperature to 60 ° C.

In molding the resin composition thus obtained, usable construction methods include a method of directly laminating construction on concrete or the like, and a sheet material or a panel material obtained by using the resin composition. Is roughly divided into a method of sticking it to concrete or the like with an adhesive or the like.

The method of directly laminating on concrete or the like means that a resin structure is directly impregnated into a glass fiber, an organic fiber nonwoven fabric, or a carbon fiber while using a defoaming roller on a concrete structure whose primer treatment is adjusted. It is cured by room temperature, by heating or by irradiation with ultraviolet rays, and is adhered to the structure.

Alternatively, the method of attaching a sheet material or a panel material obtained using the resin composition to concrete or the like with an adhesive or the like refers to a molded product obtained using the above soft resin composition, especially a sheet material. Alternatively, a panel material is prepared and attached to concrete or the like with an adhesive or the like. Such a sheet material or a panel material is prepared by using a device capable of continuously manufacturing a sheet or a panel, such as an SMC manufacturing device, to uniformly apply a resin composition prepared on a release-use polyester film installed in the device. Spread the reinforcing material, for example, drop a chopped strand, or put a nonwoven fabric of organic fibers, cover the surface with another polyester film for mold release, impregnate the resin composition with a roll, and remove the polyester film while defoaming. To obtain a sheet or panel sandwiched between them. 0.5 to 10 m for sheet or panel thickness
m can be formed. If it is less than 0.5 mm, the sheet is thin and difficult to produce, and the mechanical properties are impaired. If it exceeds 10 mm, the weight of the molded article impairs workability. Such sheet material or panel material can be cured at room temperature or by heating or irradiation with ultraviolet rays, and this sheet material or panel material can be used by being attached to a concrete structure with an adhesive or the like.

(Examples) Hereinafter, the present invention will be described in more detail with reference to the following Examples and Comparative Examples, but the present invention is not limited thereto. Synthesis Example 1 A four-necked flask equipped with a stirrer, a reflux tube, a dropping funnel, and a gas inlet tube was charged with 597 g of a bisphenol A type epoxy resin having an epoxy equivalent of 500, 103 g of methacrylic acid, 0.14 g of hydroquinone, and 1.4 g of 2-ethylimidazole. The reaction was performed at 120 ° C. for about 2.5 hours to obtain an epoxy acrylate (a) having an oxidation of 8.

Synthesis Example 2 163 g of 2-hydroxymethacrylate and 0.2 g of monomethyl ether hydroquinone were charged into a four-necked flask equipped with a stirrer, a reflux tube, a dropping funnel, and a gas introduction tube, and 2,6-toluene diisocyanate was used as an aromatic diisocyanate compound. 3 g was added dropwise over 1 hour at room temperature, and the reaction was carried out while maintaining the internal temperature at 50 to 55 ° C. After dropping,
The reaction is further carried out at a temperature of 50 to 55 ° C. for 30 minutes until the NCO group content becomes 14 to 15% by weight. Subsequently, 0.5 g of dibutyltin dilaurate is added, and the mixture is kept at 50 to 55 ° C. for one hour. Then, 634 g of polypropylene glycol having a molecular weight of about 1000 was added dropwise. After dropping, 75 ~
The mixture was heated to 80 ° C. and reacted until the absorption of the NCO group at 2270 cm ⁻¹ in the infrared absorption spectrum disappeared to obtain urethane acrylate (b).

Embodiment 1 An organic fiber nonwoven fabric (Mitsubishi Rayon Co., Ltd .; trade name Colvac S) was prepared on a release polyester film. Next, a mixture of the epoxy acrylate (a) / urethane acrylate (b) obtained in the above Synthesis Examples 1 and 2 at a ratio of 74 parts by weight / 666 parts by weight (10/90 by weight) was nonvolatile with styrene. The amount is adjusted to 74% by weight. Based on 100 parts by weight of this resin, 0.01% by weight of 6% cobalt naphthenate and MEKPO (methyl ethyl ketone peroxide) are used as an accelerator.
1.0 part by weight was mixed, and the obtained resin was impregnated into the nonwoven fabric so as to have a thickness of 1 mm. Next, the air bubbles were removed with a defoaming roller and then covered with another polyester film for release, and cured at 120 ° C. for 10 minutes.
A molded product was obtained. At this time, the volume content of Colvac S (trade name, manufactured by Mitsubishi Rayon Co., Ltd.) was adjusted to 15%.

Embodiment 2 FIG . Epoxy acrylate (a)
/ 252 parts by weight of urethane acrylate (b) / 448
What was mixed at a ratio of 36 parts by weight (36/64 by weight)
A molded product was obtained in the same manner as in Example 1 except that the nonvolatile content was adjusted to 70% by weight with styrene.

Embodiment 3 FIG . Epoxy acrylate (a)
/ Urethane acrylate (b) mixed at a ratio of 74 parts by weight / 666 parts by weight (10/90 by weight ratio) was adjusted to a non-volatile content of 74% by weight with styrene.
0.01 parts by weight of 6% cobalt naphthenate and 1.0 part by weight of MEKPO (methyl ethyl ketone peroxide) were mixed as parts by weight with respect to parts by weight. This is spread on a polyester film for release, and a glass fiber having a length of 1 inch is dropped at random on an SMC manufacturing machine to a thickness of 1 m.
m was adjusted with a roll to prepare a sheet molded product in which both surfaces were covered with a polyester film. The sheet was cured at 120 ° C. for 10 minutes. At this time, the volume content of the glass fiber was set to 15%.

Embodiment 4 FIG . Epoxy acrylate (a)
/ 252 parts by weight of urethane acrylate (b) / 448
What was mixed at a ratio of 36 parts by weight (36/64 by weight)
A sheet molded product was produced in the same manner as in Example 3, except that the nonvolatile content was adjusted to 70% by weight with styrene.

Comparative Example 1 Epoxy acrylate (a)
/ A molded article was obtained in the same manner as in Example 1 except that 100 parts by weight of an unsaturated polyester resin for waterproof lining “Yupika 8660” manufactured by Nippon Yupika Co., Ltd. was used instead of the urethane acrylate (b).

Comparative Example 2 Epoxy acrylate (a)
/ A sheet molded product was obtained in the same manner as in Example 3, except that 100 parts by weight of an unsaturated polyester resin for waterproof lining “Yupika 8660” manufactured by Nippon Yupika Co., Ltd. was used instead of the urethane acrylate (b). .

Comparative Example 3 Epoxy acrylate (a)
/ 518 parts by weight of urethane acrylate (b) / 222
A molded product was obtained in the same manner as in Example 1, except that the mixture was used in a ratio of parts by weight (weight ratio 70/30).

Comparative Example 4 Epoxy acrylate (a)
/ 518 parts by weight of urethane acrylate (b) / 222
A sheet molded product was obtained in the same manner as in Example 3, except that the mixture was used in a ratio of 70 parts by weight (weight ratio: 70/30).

(Test Examples) Examples 1-4 and Comparative Examples 1-4
The following evaluation was performed about the molded article obtained by. (1) Tensile properties: Each molded product must be 1 according to JISK7113.
No. dumbbells were used, and the tensile strength (strength at the maximum load) and the elongation (elongation until break) were measured at a tension speed of 5 mm / min. Repeat this measurement three times,
The average value was used as a characteristic value.

(2) Warm water resistance: each molded product is 60 mm
It was shaved to × 60 mm × 3 mm, immersed in warm water at 40 ° C., and the amount of water absorption and its appearance were examined over time. The water absorption was calculated by the following equation, and the appearance was determined by the following evaluation. Water absorption (% by weight) = {(weight mg after immersion X days) − (weight before immersion)} × 100 / (weight mg before immersion) Evaluation of appearance: ：: good, Δ: whitening, ×: crack Outbreak

(3) Heat deterioration resistance: Each molded product is JISK71
After shaving using a No. 1 dumbbell in accordance with 13 and leaving it in a hot air drier at 80 ° C. for 168 hours, it is allowed to cool to room temperature and has tensile strength (strength at the maximum load) and elongation (elongation to break) ) Was measured at a pulling speed of 5 mm / min. This measurement was repeated three times, and the average value was used as a characteristic value. The tensile strength and the elongation are shown as tensile property retention (%) when treated in an environment of 80 ° C./168 hours based on the normal strength, and each retention was determined by the following formula. Tensile properties (strength, elongation): Retention (%) = Tensile properties after heat treatment x 100 / Normal tensile properties

(4) Impact resistance: A 300 g weight of 10, 20, and 30 cm in height is used in accordance with JIS K5400 Dupont (8.3.2) using a shooting type (tip radius is 1/2 inch). When the sheet material was dropped from below and each sheet material was broken, the evaluation was x, and when there was no abnormality, the evaluation was ○.

(5) Cutability of sheet: The prepared sheet was cut with scissors for dressmaking, and cutability was determined from the state of the cut edge (micro crack). The sample having no cracks at the cut end was rated as “、”, and the sample with microcracks was rated as “x”.

Table 1 shows the results.

[Table 1]

From Table 1, it can be seen that the soft unsaturated polyester resin used in the conventional waterproof lining has a tendency that water easily penetrates into the inside of the cured product and is susceptible to hydrolysis. It can be seen that the elongation is greatly reduced.

[0060]

The soft resin composition of the present invention retains excellent properties without increase in water absorption due to hydrolysis and generation of cracks even after immersion in warm water, has excellent water resistance, and is treated at a high temperature. It also maintains excellent tensile properties before processing without being hard, and has excellent DuPont impact properties and sheet cutting properties. Further, since the molded article of the present invention uses the above soft resin composition, a lining, sheet or panel excellent in waterproofness, tensile properties, workability, impact resistance and the like can be obtained.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08L 55/00 C08L 55/00 // C08L 33:00

Claims (8)

[Claims] 1. A resin composition comprising (A) an epoxy acrylate, (B) a urethane acrylate and (C) a copolymerizable monomer, wherein (A) an epoxy acrylate and (B) a urethane acrylate. Weight ratio is 40/6
0 <(A) epoxy acrylate / (B) urethane acrylate ≦ 10/90. 2. The soft resin composition according to claim 1, wherein the epoxy acrylate (A) is a reaction product of a bisphenol type epoxy resin and (meth) acrylic acid. (B) a urethane acrylate is a compound having one or more hydroxyl groups and one or more copolymerizable unsaturated groups in one molecule, a glycol having two or more hydroxyl groups in one molecule, The soft resin composition according to claim 1, wherein the soft resin composition is a reaction product of a polyol and / or a compound having two or more isocyanate groups in one molecule. 4. The glycol and / or polyol having two or more hydroxyl groups in one molecule is polyethylene glycol and / or polypropylene glycol obtained from ethylene oxide and / or propylene oxide, respectively. The soft resin composition according to the above. 5. The soft resin composition according to claim 1, further comprising a reinforcing material. 6. The soft resin composition according to claim 5, wherein the reinforcing material is an organic fiber nonwoven fabric. 7. The soft resin composition according to claim 5, wherein the reinforcing material is glass fiber and / or carbon fiber. 8. A molded article obtained by curing the soft resin composition according to claim 1 by heat or light.